Attachment for opaque projection by transparency projectors



y 1952 H. G. FITZ GERALD 2,596,393

ATTACHMENT FOR OPAQUE PROJECTION BY TRANSPARENCY PROJECTORS Filed May 25, 1949 3 SheetsSheet 2 4 www- May 1952 H. G. FlTZ GERALD ATTACHMENT FOR OPAQUE PROJECTION BY TRANSPARENCY PROJECTORS Filed May 23, 1949 s Sheets- Sheet 3 d M R. e m 6 w V.f a 3 a M W H Affor-ney Patented May 13, 1952 UNITED STAT ES PATENT:

ATTACHMENT FGR OPAQUE' PROJECTIQNA BY TRANSPARENCY PROJEGTQRS:

HaroldGrFitz Gerald; Los Angeles, Qalif; Application ayer, 1949-, s ans; 9.4591 3 Thisinvention has to do with an attachment fontranspa-rency projectors and it is ageneral object of -the'invention to provide a simple .ef' fective convenient structure applicable to a transparency projector to render it suitable for handling or projecting opaque subjects.

Transparency prfll estersare-in: general use. and serve, generally; to direct lightthroughatransparent filmor the" like and to project such transmitted' light onto a screen. The general' type of transparencyprojector to which the present invention is applicable involves a body having a top with a light opening and a light source is located in the body and directs a beam of light upwardly through the top of the body and through a transparency on" the top of the body, thereheing a projector mounted above the body to receive the transmitted light and project it onto a screen.

It is a general object of this-inventionto provide an attachment applicable to a transparency projector of the general character referred to which is-in the'nature of an insert applicable be-' tween the body of the transparency projector and the projector head thereof, which. insert carries or involves. illuminating means serving toilluminatean. object: in the. attachment. so that reflected light ishandlediby the projector head.

:Itsiszanother: obj ect. of the inventiongto provide..

an attachment; of; thageneral. character referred to which includes: cooling means serving. toycirculate cooling. air. in; the attachment so,that, an; operator cammanipulate an object the atacbmeo mo ma kion o xq herw s a d an ob ec th va t ment .w houtda ee or on n ence. ,The umina n m an ncl de n th limen inv v s on o vmq ro e u larnps in action generate a substantial amount; of. heat. Howeveri the. cooling means provided the present invention so circulates cooling-airdn the'attachmentthat the heatis dissipated: and doesnot injure or curl objects being projected and does not detrimentallyafiect an-operatorgfs handthat may be. arrangedlpr ma n ain dinihe ttaehme t- ,Itis another object. of the invention to. pro.- vide an attachment of. the generalcharacter ferred: t wh c i i eh that ma ea i and quickly applied. to ;the. transparency proieetq an "wh i oes (n uir al era or 5. dismantling; ofythe transparency proj ectoreither It is a further object of the present invention aterman moleste 2 012M1 6 a i i eats a nlisahle ate a1:trimft iite nl'e".i xEIQiWt t ut l z parts, thereofv and which 215.0.f simn a n xpensive construction. and atz-theasame time simple; com venient. andxpracticalzto use;

The various objects. and. .ieatunes: of; my in: vention willjbetfullyunderstood from theifollowing. detailed.descriptionoftypicahpreierreddorms and applications.- .of the invention; throughout.

Oif a a w th it u tur tbeiii uai ew zta s a a n c tem i e 1 -4 i f lter n a g d deta l -p an epiiqn' q t Q structure, being a view taken as indicated by -fi.-.fi-. ar e-i Iliaflji ani nhrsedd tail nal take asu nsl aeiedy 2. r-r on Fig. 5;. iFigigfi isan enlarged det led sectional view: taken as indicat d ha 11 n?- J i tia..- 4- Figee isarnenlaregdidetailed section zv ew' taken asrrindicated;byline;.9-:a9.e0n..-.F e 5:- i 1-0-- is an enlarged. detailed sectional;i-Uviewm taken.

an enlarged detailed sectionalhwiew taken. as indicated byline l'-| il on 5*, and: Fig. =12. is an enlarged detailed se'ctional viewofi amodified form of illuminating-moansthat-ma be employed in carryingout the invention.

The attachment provided by-the present inven e i i a pl able .eea rell z an re nc o c o 9 ihrasene l ot er-1 practice. the} invention may be. carried out through. Variqus tq l ll t ibll Mil -W 3 ma ners" F accommodate or coniorrn to va s, details that. y be sweeten d he ire t tular trea 3 parency projector to which the attachment is to be applied.

The particular transparency projector illustrated in the drawings involves, generally, a body A which is a box-like structure having a flat top H] with a light opening I I closed by a transparent cover or top section 12. A light or illuminating means B is located in the body A and is shown as involving a lamp I4 and a reflector I5 located in the forward end portion of the body and serving to project a shaft of light toward the rear of the body. A reflector or mirror C is located in the body to receive the light from the light source B and direct it upwardly through the light opening H in the top [0 of the body. A suitable lens D is mounted in the body below and in register with the light opening ll so that the light re flected by the mirror C is directed in a suitable beam or shaft upwardly through the transparent top section [2. A projector head E is carried by a suitable mounting means F so that it is spaced. above and in vertical alignment with the light opening ll. When the structure is being used to project transparencies a transparency is located on the top [0 in register with the transparent section [2, and the light is directed up through the transparency to the projector head E.

The projector head E in the case illustrated involves a case with a bottom light opening 21 through which light is admitted into the case. A forward or front light opening 22 is provided in the case and is preferably closed by a transparent cover 22 A suitable mirror or reflector 23 is provided in the case 20 so that light projected up through the opening 2| strikes the mirror and is reflected forward to fall upon a suitable screen or the like. In the case illustrated the mirror 23 is supported through a suitable pivot or hinge connection 24 and an adjusting screw 25 is provided so that the angle or pitch of the mirror 23 can be adjusted from the exterior of the case. A suitable lens 26 is carried in a holder 27 to cover or register with the light opening 2! so that light shining upward is handled by the lens directed throughthe opening 2| and falls upon mirror 23 to be directed forward through opening 22.

The mounting means F carrying the projector head E preferably involves a vertical post or standard 30 projecting upward from the body A at the rear thereof and a bracket 3! carried by the standard andsupporting the head E through the case 20 thereof. In the particular case illustrated the bracket 3| has spaced arms 33 which are slidably engaged on the post 30. The arms are split and carry clamp screws 34 so that they can be set to grip the post and thus set the bracket in the desired position thereon. A pin 35 is carried by one of the arms 33 and operates in a longitudinal slot 36 in the post so that the bracket is held to project in the desired direction from the post.

In the form. of the invention illustrated the bracket 3i has a forwardly projecting lug 40 received between spaced ears 4| projected from the case 20 of the projector head and a connecting screw 42 is provided to secure the lug 4i! and ears 4| together so that the projector head is effectively secured to the bracket.

In practice means may be provided for operating the bracket vertically on the post 30 when the clamp screws 34 are released. In the drawings this operating means is shown as involving a rack 45 fixed on and extending longitudinally of the post 30,v a pinion 46 carried by a shaft 41 and meshing with the rack and a mounting means 48 applied to the bracket and carrying the shaft. One end of the shaft projects from the mounting means 48 and carries an operating knob 49. With this construction rotation of the knob 49 causes operation of the pinion 48 which cooperates with the rack and causes vertical movement of the bracket 3!. It will be apparent that in practice the structure just described may be constructed with enough friction so that the bracket will remain in an adjusted position without requiring operation of the clamp screws 34.

The attachment provided by the present invention is in the nature of an insert engageable between the body A and the projector head E of the structure above described. In the form of the invention illustrated the insert involves a base G, a hood H carried by and projecting upwardly from the base, illuminating means J carried by the hood and cooling means K related to the hood and serving to cool the interior thereof.

The base G of the attachment is preferably a simple flat plate and as shown in the drawings it may be so shaped and proportioned to rest upon the top ID of body A so that it occupies a substantial portion of the top of the body and overlies the transparent section !2 to be in vertical register with the projector head E.

The hood H provided by the invention is preferably carried by or fixed to the base G and projects upwardly therefrom to form a housing-like construction extending from the body A to the projector head E, as clearly shown in the drawings. broader aspects of the invention the hood may vary widely" in size, form, shape and construction.

In its preferred form the hood H forms an upwardly convergent structure or light shaft and is considerably larger at its lower end than at its upper end. In practice it is convenient to form the base G so that it is rectangular in plan configuration, in which case the lower end of the hood H is correspondingly shaped. In the particular case illustrated the hood H is polygonal or rectangular in cross section throughout its length and is formed of a flat front wall 50, flat back wall 5! and flat side walls 52. The several walls forming the hood are upwardly tapered or convergent and they cooperate, as shown in the drawings, to form an upwardly tapered or convergent duct through which light is effectively passed from the base to the projector head E which occurs at the upper end of the hood.

In the preferred form of the invention the upper end of the hood is shaped to substantially correspond with the shape of the projector head and the projector head maybe related to the upper end of the hood to enter somewhat into the hood, as shown throughout the drawings. It-

base G. In the particular case illustrated there are two access openings 63 one in each of the sides 52 of the hood, and these openings are horizontally disposed slotlike openings located at the lower ends of the sides or where the sides join the base. I 4

In accordance with the invention suitable closures 6! are provided for the access openings and In practice and in accordance with the 5, in practice the closures may be flexibleflapsof suitable fabric, orzthe like, joined at the sides 52 immediatelyabove the openings 62 so. that they normally depend .to hang over and cover the openings.

The invention further provides a .hand ,hole 85 in the'hood H and in the preferred arrangement the handhole 65 is located in thefront 5c of: thehood andplike the openings 69 it islocated at:the lower end of the hood to be adjacent the base as :shown inthe drawings- .A'suitableclosure '66 is'providedfor the hand hole 65. In-practice the closuremay'bein .the nature; of a 'flexiblezflap or curtain-like construction; formed :of one or more sections of flexible material,. such, as .suitablecloth or the like, and

the .1 parts of the closure "maybe. secured to the frontfifl ofthe hood immediately abovetheopen ingfiE; so that:they normallyhangor "depend in suchmannersas to cover theopening. Byprovidingithe closure fieinoverlapping sections X-and Y, as. shown inFig. 2, the, hand of-the operator can be conveniently passed between .the closure sections and into the hood to handlezoract-upon an object O in thehood.

The invention further provides the hood H with a sightopening 68 which enables the operator to view the interior of the hood and more specifically an object located on the base G. In the preferred form of the invention the sight opening 68 is located in the front so of the hood and it is provided with a transparent cover 69, preferably in the form of a lightfilter which suitably outs outa certain amount of the light thatwould otherwiseissue .from the opening G8 whileat the same time it allows the operator'a full and proper viewof theobJ'ectO located on the base G.

Theilluminating. means J provided by thepresrent invention preferably involves a plurality of light soureesllocated inthe. hood H and preferably carried by the hood. The light sources are so located as to effectively illuminate an object O on the base G in such manner as to leave the object'free of shadows even when an operator is indicating or marking on the object as in the course, of explaining or demonstrating with reference to the object.-

In the preferred form of the invention there are two units of the means J and these are located at the sides 52 of the hood H to be within the hood. In the preferred form of the invention, as illustrated, the units J are carried by the sides of the hood and each side 52 of the hood H is provided with an outward lateral extension or projection 80 having front and rear sides BI and 82, respectively, which are, in effect, continuations of the front and rear sides 56 and of the hood, respectively. Each extension 8! also has a top 83 carried by and extending between the sides 81 and 82, which top is pitched or inclined to be in a plane normal to a line extended from the center of the base G and substantially through the center of the extension at. The ex tension is further provided with a bottom 34 as clearly shown in Fig. 4 of the drawings.

In the form of the invention illustrated in Figs. 1 to 11, inclusive, each unit of the illuminating means includes a lamp 85 and a reflector 86 which elements are related to and preferably carried by an extension 89 of the hood. In the preferred arrangement the lamp of each unit is carried in a socket 81 provided on the botom 84 of the extension 88 while the reflector 86 is a concave-convex element with its concave side 88 faced inwardly and having a marginal flange 89 by which it is secured to .the:top.83;1or the extension beiimregisterwith an opening lifliprovided inithe,

top.

Through the .arrangementgdescribedlight: from the lamp shines directly ontotheI-basfit (icon to an object on the base G- and:light.,tfromzfthe lamp is caught by thereflector BBandis-directed onto the base .G;.orzanzobiect locatedlthercon. .By;

tiv ly illuminated without, in any way 0b? structing free passageor :reflection of flight-upeward from the basegor an objecton the basevto thecprojection 'headat theiupper endof, the; hood.

The, cooling means K provided by the present;

inventionis-shown as involving, generally armo torzdrivenblower located; at the exterior ofrthe;

partshereinabove described and distributor ducts 9| and ,92 handling air from the, blower'and discharging it intothehood in a most advantageous manner,

The motor driven blower 9B ispreferablydocated at the rear end of the body A andin the case illustrated it is detachably connected with thetransparency projector by meansor a: booklike bracket 94 and abrace-eo, The hookelike bracket 94 engages around thepostor standard 30 of mounting means F while thehrace' 55; bears, against'therear endof the body:A.

In the particular case illustratedpthe blowen fit! delivers an to a header or, manifold 95 andthe ducts 9| andeziareconnected-toandextend from themanifold 95. There, are two ducts 191,

extending fromrmanifoldjfifi to the extensionsgflflof the hood and they open into the extensions:

til of the hood through ports 9,] in therearwalls 82ofthe hood extensions. .The portsrd'l'ar preb erably so located "that air passedthrough-them from the blowerimpinges upon the lamps 85 located inv the hood extensions-80: andthus serves to effectively cool the lamps and the. parts fadjacent thereto.

The duct 92rextends from the manifold 9.6:.tothe back 5! of the hood1H wherelit connectswitha port 98 in the back 5| which port is equipped with a baffle 99 serving to direct the air passed between port 98 downwardly and onto the center portion of the base G to effectively cool the base G or an object thereon or the hand of an operator that may be in the hood H manipulating, handling, or operating an object in the hood.

In practice the several ducts of the means K may be flexible elements or hoses which give the attachment suitable freedom of manipulation and it is preferred that flexible electric cables llll be extended from a control switch I02 to extend to the motor driven blower 90 and to the sockets 81 of the lamps in a manner such as is illustrated in the drawings. In such an arrangement the cables may be connected to the sockets through detachable plug connections IE3 and the cables may be extended so that the switch I02 can, in practice, be located at a point most convenient to the operator.

In the form of the invention illustrated in Fig. 12 of the drawings the illuminating means provides a structure somewhat different than that hereinabove described. In this second form of construction a reflector 86 is provided immediately behind the lamp 85 and is carried by a mounting Ill) so that it is entirely independent of parts of the hood extension 80. In this case the 7 top 83 of'the hood extension is provided with a cap or dome-shaped cover III which is spaced from the reflector 86 A suitable lens I I2 is provided in front of the lamp 85 serving to concentrate light from the lamp on the base G or on an object O on the base G.

From the foregoing description it will be apparent how the transparency projector may be operated in the manner originally intended for this construction until such time as it is desired to project an opaque object, whereupon the attachment provided by the present invention may be applied to the transparency projector by inserting the hood between the body A and the projector head E, arranging the motor driven blower at the exterior of the structure and suitably connecting the lines I01 through which the blower and lamps are energized. With the attachment in place the control switch I02 is closed causing the lamps to burn and the blower to operate. Under such condition the base G or an object O on the base G is brilliantly illuminated by the light from the lamps and light reflected upward therefrom received by the projector head.

The projector head can be conveniently adjusted to handle such light so that it is projected in the desired manner onto a screen or the like. In the course of using the attachment the operator can pass objects into and out of the attachment through the access openings 60 and the operator's hand can be inserted into the hood or even maintained therein, as conditions may require, by inserting the hand through the hand hole 65. Since the cooling means operates constantly air circulates within the hood preventing excessive temperatures from developing therein and objects on the base G are not injured by heat and an operator is not inconvenienced by placing or maintaining his hand in the hood. To reestablish the transparency projector in its original condition it is merely necessary to remove or dislodge the parts of the attachment, all of which leaves the transparency projector in its original state and ready for operation as originally intended.

Having described only typical preferred forms and applications of my invention I do not wish 8 to be limited or restricted to the specific details herein set forth, but wish to reserve to myself any variations or modifications that may appear to those skilled in the art and fall within the scope of the following claims.

Having described my invention, I claim:

An attachment for a transparency projector having a box-like body with a light passing opening in the top and a post projecting up from the body and supporting a light projecting head spaced above the opening including, a base ap-v plicable to the top of the body to rest thereon, a

hood carried by the base projecting upward therefrom to the head and including a back, a front with a hand hole therein and sides with access openings therein. flexible closures carried by the hood normally closing the hole and opening, illuminating means carried by the hood directing light to illuminate an object on the base so reflected light therefrom passes to the head, and cooling means delivering cooling air into the hood including a motor driven blower carried by one side of the body and ducts delivering air from the blower to the hood through the back thereof and onto the illuminating means.

HAROLD G. FITZ GERALD.

REFERENCES CITED The following references are of record'in the file of this patent:

UNITED STATES PATENTS Number Name Date 658,255 Fulgora Sept. 18, 1900 1,111,090 7 Patterson Sept. 22, 1914 1,202,754 Patterson Oct. 24, 1916 1,687,946 Massiot Oct. 16, 1928 1,841,063 Semenitz Jan, 12, 1932 2,029,871 Johnson Feb. 4, 1936 2,273,936 Caroni Feb. 24, 1942 FOREIGN PATENTS Number Country Date 505 Great Britain of 1912 276,961 Germany July 23, 1914 453,142 Germany Nov. 29. 1927 

